Convert between Ra, Rz, Rt, RMS, CLA, N Grade and triangle symbols. Includes typical machining processes for each finish level.
Featured: Ra • Rz • RMS • N Grade • Triangle
Ra values and typical processes
Enter value to see conversions
N1: Ra 0.025 μm (mirror)
N6: Ra 0.8 μm (fine turning)
N7: Ra 1.6 μm (standard turning)
N9: Ra 6.3 μm (rough machining)
△△△△: Ra ≤ 0.2 μm
△△△: Ra 0.4–0.8 μm
△△: Ra 1.6–3.2 μm
△: Ra 6.3–12.5 μm